var chapter_list = new Array(
  ["Select Another Chapter Naruto","/"],
  ["Naruto Ch 625: The real dream","http://www.mangablank.com/2013/04/naruto-chapter-625.html"],
  ["Naruto Ch 626: Hashirama and Madara 2","http://www.mangablank.com/2013/04/naruto-chapter-626.html"],
  ["Naruto Ch 627: Sasuke's Reply","http://www.mangablank.com/2013/04/naruto-chapter-627.html"]
);

for (var i = 0; i < chapter_list.length; i++) {
  document.getElementById('top_chapter_list').options[i] = new Option(chapter_list[i][0], chapter_list[i][1]);
  document.getElementById('bottom_chapter_list').options[i] = new Option(chapter_list[i][0], chapter_list[i][1]);
}
document.getElementById('top_chapter_list').value=current_chapter;
document.getElementById('bottom_chapter_list').value=current_chapter;
var current_chapter_index = document.getElementById('top_chapter_list').selectedIndex;